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Health and Safety

Executive

Design AuthorityFor

New Civil Reactor Build

Bob Jennings

ND 6D

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Health and Safety

Executive

Definition of Design Authority?

A part of the Licensees organisation with aduty to maintain the knowledge of the designintegrity of its nuclear facility throughoutwhole lifecycle of the facility.

While maintaining the integrity of the safety case

is an important element in the DAs role it isbroader than this covering detailed engineeringsubstantiation and supporting design

documentation.

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DA Roles INSAG 19 (not para 30)

For example: Establish a detailed understanding of why the design

is as it is.

Develop an understanding of the experimental andresearch knowledge on which the design is based.

Capture and retain design inputs such as basicfunctional requirements, performance requirements,safety goals and safety principles, applicable codes,standards and regulatory requirements, designconditions, loads such as seismic loads, interface

requirements, etc.

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DA Roles INSAG 19 (2)

Develop a detailed knowledge of the designcalculations which demonstrate the adequacy of thedesign and the ability to reproduce the designcalculations if needed.

Acquire an understanding of the inspections, analysis,testing, computer code validation and acceptancecriteria used by participating design organizations toverify that the design output meets the designrequirements.

Understand the assumptions made in all the stepsabove, including assumptions related to operatingmodes or procedures, expected life history such aschanges in fluence, expected transients, etc.

Review the implications of operating experience on thedesign.

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DA- Employees and Contractors

It is not expected that the Licensee will have tocover all technical areas in great depth with its

own staff. Use of support contractors for very detailed

areas of the facilitys design integrity is allowed.

The Licensee however must have in-houseknowledge of all major technical areas at IC and

practitioner level.

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Links to Licence Conditions

LC12 DULY AUTHORISED AND OTHER SUITABLYQUALIFIED AND EXPERIENCED PERSONS.

LC14 SAFETY DOCUMENTATION.

LC15 PERIODIC REVIEW. LC22 MODIFICATION OR EXPERIMENT ON

EXISTING PLANT

LC23 OPERATING RULES. LC28 EXAMINATION, INSPECTION, MAINTENANCE

AND TESTING.